Structure and dynamics investigations of a partially hydrogenated graphene/Ni(111) surface

被引：19
|
作者：
Bahn, Emanuel [1 ,2 ]
Tamtoegl, Anton [2 ,3 ]
Ellis, John [2 ]
Allison, William [2 ]
Fouquet, Peter [1 ]
机构：
[1] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France
[2] Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England
[3] Graz Univ Technol, Inst Expt Phys, Petersgasse 16, A-8010 Graz, Austria
来源：
CARBON | 2017年 / 114卷
基金：
英国工程与自然科学研究理事会; 奥地利科学基金会;
关键词：
Graphene; Ni(111); Hydrogenation; Helium atom scattering; ATOMIC-HYDROGEN; REVERSIBLE HYDROGENATION; EPITAXIAL GRAPHENE; MONOLAYERS; DIFFRACTION; TRANSITION; ADSORPTION; SCATTERING; DIFFUSION; EXPOSURE;
D O I：
10.1016/j.carbon.2016.12.055
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Using helium(-3) atom scattering, we have studied the adsorption kinetics, the structure and the diffusional dynamics of atomic hydrogen on the surface of a graphene monolayer on Ni(111). Diffraction measurements reveal a 4 degrees rotated rectangular hydrogen overstructure. Hydrogen adsorption and desorption exhibit activation barriers of E-a = (89 +/- 7) meV and E-d = (1.8 +/- 0.2) eV, respectively. Helium(-3) spin-echo measurements showed no decay of the spatial correlation function (or intermediate scattering function) within the time range of the spectrometer. Hence, we are able to set lower limits for a possible hydrogen surface diffusion rate. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：504 / 510
页数：7
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